In the eastern Marib province, where the coalition has been focusing its operations in recent days, pro-government military sources said air strikes hit two separate rebel convoys.

Military officials on the Saudi border told the AFP news agency that 20 more coalition military vehicles crossed into oil-rich Marib, following at least 40 similar vehicles a day earlier.

The reinforcements are being sent in preparation for an offensive to retake the capital, seized by the Shia Houthi fighters a year ago.

Meanwhile, the United Arab Emirates announced that it has now received the remains of 54 of its soldiers who were killed in a missile strike in Marib last week, according to the official WAM news agency.

The UAE had given an earlier toll of 45 of its soldiers lost in the attack.

Ten Saudis and five Bahrainis were also killed in the strike, claimed by the Iran-backed Houthi rebels.

The UAE said its jet fighters had carried out several strikes against rebel positions across Yemen Friday "targeting the military depots, command and control buildings and Houthi militia strongholds," WAM reported.

The United Nations estimates that Yemen's conflict has killed more than 4,500 people since March.

On Thursday, the UN special envoy for Yemen, Ismail Ould Cheikh Ahmed, said the exiled government and rebels had agreed to take part in peace talks in the region next week.

However, in the absence of any announcement from the rebels, government spokesman Rajih Badi said he was unsure they would attend the talks, which he said will take place in neutral Oman without specifying a date.

The government of exiled President Abd-Rabbu Mansour Hadi confirmed it will join the talks but insisted that a rebel pullback from areas seized since last year - as outlined by UN Security Council Resolution 2216 - remained a precondition for negotiations.